| Solanum quichense J.M. Coult. & Donn. Sm., 1904 |
| Solanum quinquangulare Roem. & Schult., 1819 |
| Solanum quitoense Lam., 1794 |
| Solanum rantonnetii Carrière, 1859 |
| Solanum receptum Van Heurck & Müll. Arg., 1870 |
| Solanum reconditum Correll, 1961 |
| Solanum remyanum Phil., 1895 |
| Solanum roei Ugent & Iltis, 1978 |
| Solanum roemerianum Scheele, 1848 |
| Solanum rugosum Dunal, 1852 |
| Solanum salamanii Hawkes, 1944 |
| Solanum salviaefolium Dunal, 1852 |
| Solanum salviifolium Lam., 1793 |
| Solanum sarmentosum Sessé & Moc., 1892 |
| Solanum schiedeanum Schltdl., 1847 |
| Solanum schippii Standl., 1935 |
| Solanum schizostigma Bitter, 1912 |
| Solanum schlechtendalianum Walp., 1844 |
| Solanum semidemissum Juz., 1937 |
| Solanum setosum (Brandegee) Bitter, 1922 |